Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

Zilong Zhou, Haiquan Wang, Xin Cai, Lu Chen, Yude E and Ruishan Cheng
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Zilong Zhou: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Haiquan Wang: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Xin Cai: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Lu Chen: School of Civil Engineering, Changsha University of Science & Technology, Changsha 410076, China
Yude E: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Ruishan Cheng: School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Energies, 2019, vol. 12, issue 23, 1-17

Abstract: Rock stability has long been a hot topic during underground energy exploitation, but the failure process of rock materials under earthquake effects is extremely complicated, and the failure mechanism still remains unclear. In order to investigate the fatigue damage and failure behavior of rocks under aftershock effects considering the post-mainshock damage states, a series of laboratory tests were conducted on marble specimens subjected to stepwise cyclic loading. Four levels of peak stress (i.e., 10, 30, 50, and 70 MPa) were applied in the first cycle, to simulate mainshock damage. The results indicate that, with the increase of initial cycle amplitude, mainshock damage has a significant effect on deformation behavior, dissipated energy, P-wave velocity, and AE characteristics of tested specimens during aftershock process. The increasing amplitude of initial cycle enhances irreversible deformation and weakens the resistance to deformation, which accelerates the expansion of specimen volume and results in the reduction of bearing capacity. Furthermore, the increasing amplitude of initial cycle obviously changes the failure morphologies and intensifies the final macro-fracture scale of tested specimens, which are verified by acoustic emission AF-RA value and b -value, respectively.

Keywords: mainshock damage; cyclic loading; damage evolution; ultrasonic P-wave velocity (UPV); acoustic emission (AE) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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